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From pbslearningmedia.org (Approved: Mrs Jefferies), produced by WGBH Educational Foundation

This interactive activity from NOVA scienceNOW illustrates the function of RNA interference (RNAi), a mechanism by which cells interrupt the process of protein synthesis. By effectively silencing genes, RNAi helps to fight infections. Scientists hope that one day they will be able to use this powerful mechanism in the treatment of a wide variety of genetic diseases.
*Not all will agree with the introduction (dealing with evolution), but the active video and metaphor link (putting the science in plainer terms) are a great way of explaining RNA.* You may be requested to sign-up/register. It is free.

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